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本文是李德平先生为促进中国辐射防研究院内翻译工作的交流所写。编者考虑到对于广大科研工作者来讲，同样具有启发性和指导意义，于是征得作者同意后在此刊登，以飨读者。
This article is written by Mr. Li Deping to promote the exchange of translation work in China Institute of Radiation Protection. Editor considered for the majority of researchers in terms of the same instructive and instructive, so with the consent of the author published here to readers.